Fireduino TFT 字符显示
更新时间：2017-08-08 阅读：14170
目录
Fireduino TFT
Fireduino TFT 采用与传统的Arduino TFT 同属一些列的LCD 驱动器，为ST7735S，与Fireduino 通过I8080 接口连接，比传统Arduino TFT 的SPI 方式 刷新速率快一个级别。
Fireduino TFT库
Fireduino TFT 库 基于ST7735S 驱动扩展 Adafruit GFX 而成的TFT库，Adafruit GFX负责绘制图形，ST7735S 负责驱动LCD 显示屏，它兼容 Adafruit GFX API，Fireduino 连接 TFT 后如下图：
Fireduino TFT 字符显示
本案例演示如何在Fireduino 的TFT配件上绘制文本，每隔一定时间循环读取Fireduino 的模拟输入口A0,并把其值显示在TFT 显示屏上。
硬件要求
1.Fireduino board
2.Fireduino TFT board
代码
开始之前
使用TFT 屏幕，首先得包含TFT库头文件。
#include <TFT.h>定义你的TFT 屏幕，并创建一个实例对象
TFT TFTscreen = TFT();
更新屏幕文本信息，你需要一个缓冲区
char sensorPrintout[4];
setup()
1.初始化屏幕
2.设置背景色
3.通过 stroke() 设置字体颜色
4.设置文本字符大小
5.往屏幕写入静态文本。
void setup() { // Put this line at the beginning of every sketch that uses the GLCD: delay(1); TFTscreen.begin(); delay(1); // clear the screen with a black background TFTscreen.background(0, 0, 0); // write the static text to the screen // set the font color to white TFTscreen.stroke(255, 255, 255); // set the font size TFTscreen.setTextSize(1); // write the text to the top left corner of the screen TFTscreen.text("Sensor Value :\n ", 0, 0); // ste the font size very large for the loop TFTscreen.setTextSize(5); }
loop()
1.读取来自外部输入电压后转换为字符串文本。
2.设置文本颜色并把文本写入屏幕。
3.延时后把刚才写入的文本清除。
void loop() { // Read the value of the sensor on A0 String sensorVal = String(analogRead(A0)); // convert the reading to a char array sensorVal.toCharArray(sensorPrintout, 4); // set the font color TFTscreen.stroke(255, 255, 255); // print the sensor value TFTscreen.text(sensorPrintout, 0, 20); // wait for a moment delay(250); // erase the text you just wrote TFTscreen.stroke(0, 0, 0); TFTscreen.text(sensorPrintout, 0, 20); }
示例程序 -- TFT 字符显示
#include <TFT.h> // Arduino LCD library // create an instance of the library TFT TFTscreen = TFT(); // char array to print to the screen char sensorPrintout[4]; void setup() { // Put this line at the beginning of every sketch that uses the GLCD: delay(1); TFTscreen.begin(); delay(1); // clear the screen with a black background TFTscreen.background(0, 0, 0); // write the static text to the screen // set the font color to white TFTscreen.stroke(255, 255, 255); // set the font size TFTscreen.setTextSize(1); // write the text to the top left corner of the screen TFTscreen.text("Sensor Value :\n ", 0, 0); // ste the font size very large for the loop TFTscreen.setTextSize(5); } void loop() { // Read the value of the sensor on A0 String sensorVal = String(analogRead(A0)); // convert the reading to a char array sensorVal.toCharArray(sensorPrintout, 4); // set the font color TFTscreen.stroke(255, 255, 255); // print the sensor value TFTscreen.text(sensorPrintout, 0, 20); // wait for a moment delay(250); // erase the text you just wrote TFTscreen.stroke(0, 0, 0); TFTscreen.text(sensorPrintout, 0, 20); }
